US8311018B2 - System and method for optimizing location estimate of mobile unit - Google Patents
System and method for optimizing location estimate of mobile unit Download PDFInfo
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- US8311018B2 US8311018B2 US12/014,018 US1401808A US8311018B2 US 8311018 B2 US8311018 B2 US 8311018B2 US 1401808 A US1401808 A US 1401808A US 8311018 B2 US8311018 B2 US 8311018B2
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- 238000000034 method Methods 0.000 title claims abstract description 127
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Images
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
- G01S5/0205—Details
- G01S5/021—Calibration, monitoring or correction
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
- G01S5/0205—Details
- G01S5/0244—Accuracy or reliability of position solution or of measurements contributing thereto
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
- G01S5/0252—Radio frequency fingerprinting
- G01S5/02521—Radio frequency fingerprinting using a radio-map
- G01S5/02524—Creating or updating the radio-map
- G01S5/02525—Gathering the radio frequency fingerprints
- G01S5/02526—Gathering the radio frequency fingerprints using non-dedicated equipment, e.g. user equipment or crowd-sourcing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
- H04W4/029—Location-based management or tracking services
Abstract
Description
where N is the number of estimated locations and di is the Euclidean distance from the ith estimated location to the final estimated location.
where N is the number of estimated locations, di is the Euclidean distance from the ith estimated location to the final estimated location, and wi is a series of weighting factors.
C_Ratioi =[C i −C min ]/[C N −C min] (3)
where Ci is a metric associated with an ith candidate grid point, CN is a metric associated with the worst corresponding candidate grid point, and Cmin is a metric associated with the best corresponding candidate grid point. It follows that grid points having a Cratio less than a predetermined and configurable threshold value may be a candidate for interpolation.
C_Ratioi =[C i −C min ]/[C min] (4)
where Ci is a metric associated with an ith grid point and Cmin is a metric associated with the best corresponding grid point. Equation (4) may thus enable an identification of appropriate grid points for interpolation when N is small. Equation (4) may also be performed to prevent interpolation between widely separated grid points.
where Ci is a metric associated with an ith grid point. Weighted averaging may also be utilized rather than uniform weighting to ensure that the best matching grid point (i.e., minimum cost grid point) exerts a larger influence on the final location estimate.
where α is 0 or 1 which controls whether TA differences are included in the determination (e.g., 1 for GSM and 0 for iDEN), TArpt is the TA for the NMR, TAcond is the TA for the candidate grid point in the calibration database and/or a representative value, RxLevDiff(i) represents the difference in RxLev (received signal strength) for the ith neighbor cell or serving cell, I is an index to neighbor or serving cells (e.g., if only NC received signal strengths are used and there are six reporting NCs, then i=1 to 6; if in addition, a serving cell signal strength is included then i=1 to 7), NCCU represents an NC cost unit where an increasing NCCU increases the cost penalty for RxLev difference relative to the cost penalty for TA difference, and MAXDIFF is a configurable parameter that limits the cost incurred for differences in signal strengths. MAXDIFF may be set to 20 dB or another configurable value. RxLev differences exceeding MAXDIFF would not incur an additional cost penalty.
RxLevDiff(i)=(RxLevServ−RxLevNeigh(i))NMR−(RxLevServ−RxLevNeigh(i))CND (7)
for i=1:6;
RxLevDiff(i)=(RxLevNeigh(1))NMR−(RxLevNeigh(i))CND (8)
for i=1:6;
RxLevDiff(i)=(RxLevNeigh(1)−RxLevNeigh(i))NMR−(RxLevNeigh(1)−RxLevNeigh(i))CND (9)
for i=2:6;
RxLevDiff(i)=(AvgRxLevNeigh−RxLevNeigh(i))NMR−(AvgRxLevNeigh−RxLevNeigh(i))CND (10)
for i=1:6;
RxLevDiff(i)=(AvgRxLev−RxLev(i))NMR−(AvgRxLev−RxLev(i))CND (11)
for i=1:7.
Claims (21)
C_Ratioi =[C i −C min ]/[C N −C min]
C_Ratioi =[C i −C min ]/[C min]
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/014,018 US8311018B2 (en) | 2007-02-05 | 2008-01-14 | System and method for optimizing location estimate of mobile unit |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US89937907P | 2007-02-05 | 2007-02-05 | |
US12/014,018 US8311018B2 (en) | 2007-02-05 | 2008-01-14 | System and method for optimizing location estimate of mobile unit |
Publications (2)
Publication Number | Publication Date |
---|---|
US20080188242A1 US20080188242A1 (en) | 2008-08-07 |
US8311018B2 true US8311018B2 (en) | 2012-11-13 |
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US12/014,018 Active 2031-09-15 US8311018B2 (en) | 2007-02-05 | 2008-01-14 | System and method for optimizing location estimate of mobile unit |
US12/019,509 Active 2030-07-19 US8170579B2 (en) | 2007-02-05 | 2008-01-24 | System and method for generating a location estimate using non-uniform grid points |
US12/019,575 Active 2031-02-22 US8280384B2 (en) | 2007-02-05 | 2008-01-24 | System and method for predicting location accuracy of a mobile unit |
US12/023,841 Expired - Fee Related US8090384B2 (en) | 2007-02-05 | 2008-01-31 | System and method for generating a location estimate using a method of intersections |
US12/068,213 Active 2030-04-10 US8175620B2 (en) | 2007-02-05 | 2008-02-04 | System and method for generating non-uniform grid points from calibration data |
US12/026,352 Active 2031-06-30 US8254966B2 (en) | 2007-02-05 | 2008-02-05 | System and method to modify wireless network calibration data |
US12/026,480 Active 2031-03-16 US8406753B2 (en) | 2007-02-05 | 2008-02-05 | System and method for generating a location estimate using uniform and non-uniform grid points |
US12/026,372 Active 2033-01-26 US8938252B2 (en) | 2007-02-05 | 2008-02-05 | System and method to collect and modify calibration data |
US12/026,333 Active US7561104B2 (en) | 2007-02-05 | 2008-02-05 | Method to modify calibration data used to locate a mobile unit |
US12/026,364 Active 2031-10-06 US8326317B2 (en) | 2007-02-05 | 2008-02-05 | System and method to obtain calibration data using estimation techniques |
US12/424,320 Active 2029-12-22 US8400358B2 (en) | 2007-02-05 | 2009-04-15 | Method to modify calibration data used to locate a mobile unit |
US13/302,754 Active - Reinstated US8380220B2 (en) | 2007-02-05 | 2011-11-22 | System and method for generating a location estimate using a method of intersections |
US13/612,271 Abandoned US20130012230A1 (en) | 2007-02-05 | 2012-09-12 | System and Method To Obtain Calibration Data Using Estimation Techniques |
US13/771,542 Active US8786494B2 (en) | 2007-02-05 | 2013-02-20 | Method to modify calibration data used to locate a mobile unit |
US14/518,868 Active US9097784B2 (en) | 2007-02-05 | 2014-10-20 | System and method to collect and modify calibration data |
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US12/019,509 Active 2030-07-19 US8170579B2 (en) | 2007-02-05 | 2008-01-24 | System and method for generating a location estimate using non-uniform grid points |
US12/019,575 Active 2031-02-22 US8280384B2 (en) | 2007-02-05 | 2008-01-24 | System and method for predicting location accuracy of a mobile unit |
US12/023,841 Expired - Fee Related US8090384B2 (en) | 2007-02-05 | 2008-01-31 | System and method for generating a location estimate using a method of intersections |
US12/068,213 Active 2030-04-10 US8175620B2 (en) | 2007-02-05 | 2008-02-04 | System and method for generating non-uniform grid points from calibration data |
US12/026,352 Active 2031-06-30 US8254966B2 (en) | 2007-02-05 | 2008-02-05 | System and method to modify wireless network calibration data |
US12/026,480 Active 2031-03-16 US8406753B2 (en) | 2007-02-05 | 2008-02-05 | System and method for generating a location estimate using uniform and non-uniform grid points |
US12/026,372 Active 2033-01-26 US8938252B2 (en) | 2007-02-05 | 2008-02-05 | System and method to collect and modify calibration data |
US12/026,333 Active US7561104B2 (en) | 2007-02-05 | 2008-02-05 | Method to modify calibration data used to locate a mobile unit |
US12/026,364 Active 2031-10-06 US8326317B2 (en) | 2007-02-05 | 2008-02-05 | System and method to obtain calibration data using estimation techniques |
US12/424,320 Active 2029-12-22 US8400358B2 (en) | 2007-02-05 | 2009-04-15 | Method to modify calibration data used to locate a mobile unit |
US13/302,754 Active - Reinstated US8380220B2 (en) | 2007-02-05 | 2011-11-22 | System and method for generating a location estimate using a method of intersections |
US13/612,271 Abandoned US20130012230A1 (en) | 2007-02-05 | 2012-09-12 | System and Method To Obtain Calibration Data Using Estimation Techniques |
US13/771,542 Active US8786494B2 (en) | 2007-02-05 | 2013-02-20 | Method to modify calibration data used to locate a mobile unit |
US14/518,868 Active US9097784B2 (en) | 2007-02-05 | 2014-10-20 | System and method to collect and modify calibration data |
Country Status (6)
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US (15) | US8311018B2 (en) |
EP (5) | EP2118810B1 (en) |
AT (1) | ATE508374T1 (en) |
CA (5) | CA2677087A1 (en) |
DE (1) | DE602008006680D1 (en) |
WO (5) | WO2008097694A1 (en) |
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